sp-offset.h

#ifndef __SP_OFFSET_H__#define __SP_OFFSET_H__/** \file * SPOffset class. * * Authors: * Mitsuru Oka <oka326@parkcity.ne.jp> * Lauris Kaplinski <lauris@kaplinski.com> * (of the sp-spiral.h upon which this file was created) * Copyright (C) 1999-2002 Lauris Kaplinski * Copyright (C) 2000-2001 Ximian, Inc. * * Released under GNU GPL, read the file 'COPYING' for more information */#include "sp-shape.h"#include <sigc++/sigc++.h>#define SP_TYPE_OFFSET (sp_offset_get_type ())#define SP_OFFSET(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), SP_TYPE_OFFSET, SPOffset))#define SP_OFFSET_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), SP_TYPE_OFFSET, SPOffsetClass))#define SP_IS_OFFSET(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), SP_TYPE_OFFSET))#define SP_IS_OFFSET_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), SP_TYPE_OFFSET))class SPOffset;
class SPOffsetClass;
class SPUseReference;
/** * SPOffset class. * * An offset is defined by curve and radius. The original curve is kept as * a path in a sodipodi:original attribute. It's not possible to change * the original curve. * * SPOffset is a derivative of SPShape, much like the SPSpiral or SPRect. * The goal is to have a source shape (= originalPath), an offset (= radius) * and compute the offset of the source by the radius. To get it to work, * one needs to know what the source is and what the radius is, and how it's * stored in the xml representation. The object itself is a "path" element, * to get lots of shape functionality for free. The source is the easy part: * it's stored in a "inkscape:original" attribute in the path. In case of * "linked" offset, as they've been dubbed, there is an additional * "inkscape:href" that contains the id of an element of the svg. * When built, the object will attach a listener vector to that object and * rebuild the "inkscape:original" whenever the href'd object changes. This * is of course grossly inefficient, and also does not react to changes * to the href'd during context stuff (like changing the shape of a star by * dragging control points) unless the path of that object is changed during * the context (seems to be the case for SPEllipse). The computation of the * offset is done in sp_offset_set_shape(), a function that is called whenever * a change occurs to the offset (change of source or change of radius). * just like the sp-star and other, this path derivative can make control * points, or more precisely one control point, that's enough to define the * radius (look in object-edit). */00059struct SPOffset : public SPShape {
00060void *originalPath; ///< will be a livarot Path, just don't declare it here to please the gcc linker00061char *original; ///< SVG description of the source path00062floatrad; ///< offset radius /// for interactive setting of the radius00065boolknotSet;
NR::Point knot;
bool sourceDirty;
bool isUpdating;
gchar *sourceHref;
SPUseReference *sourceRef;
00073Inkscape::XML::Node *sourceRepr; ///< the repr associated with that idSPObject *sourceObject;
sigc::connection _modified_connection;
sigc::connection _delete_connection;
sigc::connection _changed_connection;
sigc::connection _transformed_connection;
};
/// The SPOffset vtable.00083struct SPOffsetClass
{
SPShapeClass parent_class;
};
/* Standard Gtk function */
GType sp_offset_get_type (void);
doublesp_offset_distance_to_original (SPOffset * offset, NR::Point px);
voidsp_offset_top_point (SPOffset * offset, NR::Point *px);
SPItem *sp_offset_get_source (SPOffset *offset);
#endif/* Local Variables: mode:c++ c-file-style:"stroustrup" c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +)) indent-tabs-mode:nil fill-column:99 End:*/// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :